Reading from text file.

[RexLee]

Let's say I have a file with the below data:

2

4 101 13 50 8

1 50

How would I read each lines separately in to an array like this arr[3][5], I know how to use fstream, but how do I know if i reached the end of a line, and how would I know how many numbers there are in a line.

(C++)

[RexLee]

The purpose is I want to know how to read the integers off each line, but I also want to know how many integers are on each line.So that I could do store them in to different containers.Because each line is meant to do different things.

[Tigerbomb8]

You can use 

getline(isteam, string);

http://www.cplusplus.com/reference/string/string/getline/

[WanderingFool]

Well this might help a bit

 

Reading files, one line at a time, until the end.

std::string lineData;std::ifstream rFile("text.txt");if(!rFile.is_open())	return "Error on read";while(std::getline(rFile, lineData)) {	//lineData now equals each line, and this will run until EOF}std::rFile.close();

Now for reading each item into an array....this is a bit more tricky.  C++ really doesn't have a tokenizer, although C does (but strtok is a destructive method).  So instead you could just read 1 element at a time using the << from istringstream

std::istringstream iss(lineData);int data;int temp[100]; //Assuming you have an upper limit...you could actually load the data straight into the final array if you		//really wanted though...it would be more efficient and likely cleanerint index = 0;while(index < 100){ //Keeps looping until there is an exit condition or 100 elements have been read	iss >> data;	if(iss.fail()) //Fail will mean data could not be read...thus end of data		break;	temp[index] = data;	index++; //I could have done index++ in the previous line, but it is easier to read like this}//Index will now equal the amount of elements that were in the lineData.  You can now copy them into the array

[RexLee]

Thanks I get it now.